Simulation of 3D elastic wave propagation in the Salt Lake Basin

K. B. Olsen, J. C. Pechmann, Gerard Schuster

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

A 3D finite-difference method has been used to model 0.2 to 1.2 Hz elastodynamic site amplification in the Salt Lake Valley, Utah. The valley is underlain by a sedimentary basin, which in the model has dimensions of 48 by 25 by 1.3 km. Simulations are carried out for a P wave propagating vertically from below and for P waves propagating horizontally to the north, south, east, and west in a two-layer model consisting of semi-consolidated sediments surrounded by bedrock. The results suggest that for steeply incident P waves, the impedance decrease and resonance effects associated with the deeper basin structure control and amplification of the initial P-wave arrival, whereas reverberations in the near-surface unconsolidated sediments generate the large-amplitude coda. These reverberations are caused mainly by P-to-S converted waves, and their strength is therefore highly sensitive to the incidence angle of the source. -from Authors

Original languageEnglish (US)
Pages (from-to)1688-1710
Number of pages23
JournalBulletin - Seismological Society of America
Volume85
Issue number6
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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